Trying to find the culprit

My wife has been trying to figure out her fatigue that she has been fighting for sometime now. We have looked into her symptoms and after a week of little to no carbs she has had much more energy and is feeling better overall. In an attempt to to narrow it down even more I would like to see if it is a gluten allergy (she has had NO bread pasta ect this week) or a carb issue.

Am I correct in thinking that whole grain breads are going to produce less gluten? I was thinking of turning my attention to multi grains and whole grain type breads hoping this may shed some more light on the subject. Any thoughts or ideas? Thanks in advance for any information or help you could provide.